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Rhenium Facts

Chemical & Physical Properties

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This is a photo of a bead of pure rhenium. Rhenium is a lustrous silver-white metal.

This is a photo of a bead of pure rhenium. Rhenium is a lustrous silver-white metal. Of the elements, only tungsten and carbon have higher melting points.

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Periodic Table of the Elements

Rhenium

Symbol: Re

Atomic Number: 75

Atomic Weight: 186.207

Electron Configuration: [Xe] 4f14 5d5 6s2

Element Classification: Transition Metal

Discovery: Walter Noddack, Ida Tacke, Otto Berg 1925 (Germany)

Name Origin: Latin: Rhenus, the Rhine River.

Density (g/cc): 21.02

Melting Point (K): 3453

Boiling Point (K): 5900

Appearance: dense, silvery-white metal

Atomic Radius (pm): 137

Atomic Volume (cc/mol): 8.85

Covalent Radius (pm): 128

Ionic Radius: 53 (+7e) 72 (+4e)

Specific Heat (@20°C J/g mol): 0.138

Fusion Heat (kJ/mol): 34

Evaporation Heat (kJ/mol): 704

Debye Temperature (K): 416.00

Pauling Negativity Number: 1.9

First Ionizing Energy (kJ/mol): 759.1

Oxidation States: 5, 4, 3, 2, -1

Lattice Structure: hexagonal

Lattice Constant (Å): 2.760

Lattice C/A Ratio: 1.615

References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.)

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